<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3//EN">
<HTML><HEAD>
<TITLE>IBM Visualization Data Explorer Programmer&#39;s Reference</TITLE>

<META HTTP-EQUIV="abstract" CONTENT="IBM Visualization Data Explorer
Programmer&#39;s Reference">
<META HTTP-EQUIV="contact" CONTENT="IBM Visualization Data Explorer
(ibmdx@watson.ibm.com)">
<META HTTP-EQUIV="owner" CONTENT="IBM Visualization Data Explorer
(ibmdx@watson.ibm.com)">
<META HTTP-EQUIV="updated" CONTENT="Tue, 16 Sep 1997 ">
<META HTTP-EQUIV="review" CONTENT="Fri, 14 Aug 1998 ">

<META HTTP-EQUIV="keywords" CONTENT="GRAPHICS VISUALIZATION VISUAL PROGRAM DATA
MINING">
<meta http-equiv="content-type" content="text/html;charset=ISO-8859-1">
</HEAD><BODY BGCOLOR="#FFFFFF">

<A NAME="Top_Of_Page"></A>
<H1>IBM Visualization Data Explorer Programmer&#39;s Reference</H1>
<B>&#91; <A HREF="#Bot_Of_Page">Bottom of Page</A> &#124; <A
HREF="progu162.htm">Previous Page</A> &#124; <A HREF="progu164.htm">Next
Page</A> &#124; <A HREF="../proguide.htm#ToC">Table of Contents</A> &#124; <A
HREF="progu097.htm#PToC20">Partial Table of Contents</A> &#124; <A
HREF="progu344.htm#HDRINDEX_START">Index</A> &#93;</B><HR><P>
<H3><A NAME="HDRDXGCV" HREF="progu097.htm#PToC_257">DXGetComponentValue</A></H3>
<A NAME="IDX1713"></A>
<A NAME="IDX1714"></A>
<P><STRONG>Function</STRONG>
<P>
Returns a specified component of a specified Field.
<P><STRONG>Syntax</STRONG>
<BR>
<TT><STRONG><BR>
&#35;include &lt;dx/dx.h&gt;<BR>
<P><BR>
Object DXGetComponentValue(Field f, char *name)<BR>
</STRONG></TT><BR>
<P><STRONG>Functional Details</STRONG>
<P>
Typically, Fields have a "positions" component defining a set of
points in space, a "connections" component defining the
connectivity of the positions, and a "data" component
containing the individual data values associated with
the individual positions or connections.
A Field can be manipulated by accessing these components.
The following are just two examples:
<UL COMPACT>
<LI>You can transform a Field by calling
<TT><STRONG>DXGetComponentValue(field, "positions")
</STRONG></TT> to return the "positions"
component, and then transforming the
points it contains.
<LI>You can convert a Field containing vector data to one containing
the magnitude of the vector data by calling
<TT><STRONG>DXGetComponentValue(field, "data")</STRONG></TT> to return
the "data" component, and then creating a new "data"
component containing the magnitude data to replace it
in the Field.
</UL>
<P><STRONG>Return Value</STRONG>
Returns the <TT><STRONG>name</STRONG></TT> component of Field
<TT><STRONG>f</STRONG></TT> or returns
<TT><STRONG>NULL</STRONG></TT>  and
Sets an error code if <TT><STRONG>f</STRONG></TT> is not
a Field.
It does not set an error code if the component does not exist.
<P><STRONG>See Also</STRONG>
<P>
<TT><STRONG>
<A HREF="progu131.htm#HDRDXDC">DXDeleteComponent</A>,
<A HREF="progu162.htm#HDRDXGCA">DXGetComponentAttribute</A>,
<A HREF="progu168.htm#HDRDXGECV">DXGetEnumeratedComponentValue</A>,
<A HREF="progu307.htm#HDRDXSCV">DXSetComponentValue</A>
</STRONG></TT>
<P>
<A HREF="progu044.htm#HDRFIELDSC">12.1 , "Field Class"</A>.
<P><HR><B>&#91; <A HREF="#Top_Of_Page">Top of Page</A> &#124; <A
HREF="progu162.htm">Previous Page</A> &#124; <A HREF="progu164.htm">Next
Page</A> &#124; <A HREF="../proguide.htm#ToC">Table of Contents</A> &#124; <A
HREF="progu097.htm#PToC20">Partial Table of Contents</A> &#124; <A
HREF="progu344.htm#HDRINDEX_START">Index</A> &#93;</B> <br><b>&#91;<a
href="../allguide.htm">Data Explorer Documentation</a>&nbsp;&#124;&nbsp;<a
href="../qikguide.htm">QuickStart Guide</a>&nbsp;&#124;&nbsp;<a
href="../usrguide.htm">User&#39;s Guide</a>&nbsp;&#124;&nbsp;<a
href="../refguide.htm">User&#39;s Reference</a>&nbsp;&#124;&nbsp;<a
href="../proguide.htm">Programmer&#39;s Reference</a>&nbsp;&#124;&nbsp;<a
href="../insguide.htm">Installation and Configuration
Guide</a>&nbsp;&#93;</b><br><p><b>&#91;<a
href="http://www.research.ibm.com/dx">Data Explorer Home
Page</a>&#93;</b><p><HR ALIGN=LEFT WIDTH=600><b>&#91;<A
HREF="http://www.ibm.com/">IBM Home Page</A>&nbsp;&#124;&nbsp;<A
HREF="http://www.ibm.com/Orders/">Order</A>&nbsp;&#124;&nbsp;<A
HREF="http://www.ibm.com/Search/">Search</A>&nbsp;&#124;&nbsp;<A
HREF="http://www.ibm.com/Assist/">Contact IBM</A>&nbsp;&#124;&nbsp;<A
HREF="http://www.ibm.com/Legal/">Legal</A>&nbsp;&#93;</b><hr><p>
<A NAME="Bot_Of_Page"></A>
</BODY></HTML>
